Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07a52b3aea77e14…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 15:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0ad24310b2d7e623802558c98efb55c SHA-1: ab42af2934164a78e9ccc7ae5d5bcfbfdc80fa9d SHA-256: f07a52b3aea77e1439dd3f06d8a611a6da39c757334d6b6ec9f4fde019ed2df1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://balaji-technology.com/userfiles/file/13415035422.pdf In PDF document text
    • http://millecolori.it/images/file/totanabaguxopevifarunap.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/kiganixa.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/46044498680.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c78c9d625---63535075256.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/98429759597.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64b666da4b---jorovufus.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/junotajuxiw.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fom0chsoaj485aa46u10kb9h24/27645005318.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d02bdfda---49204050626.pdfIn PDF document text
    • http://soc-in.com/data/media/files/61934450275.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/71403227745.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/56333468247.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/95487095339.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/givozi.pdfIn PDF document text
    • https://hirurgija.me//files/10819232064.pdfIn PDF document text
    • http://wych123.com/upload/files/nogaxuwerazisojuvup.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/lizapasetimasizewowa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2311e06eb9---katesapukovegubep.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/36946699005.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f69eb130ca69ff52e9c5e69d275042d9/vumomigom.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/cbee8m1njc8uv7oot9vgehfdqi/97068863282.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/212a202db9cebc704d6a1af81ae635c2/momalitivi.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/xuwimofepenesaku.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/93069295954.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/kikexomebefosuv.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/26389287022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+locate+a+living+space+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 10692 bytes
SHA-256: a8a7e1f6f225aaee826f724ccb967495453cef5a6374df679345c156fa6330d8
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 18916 bytes
SHA-256: c3c88b222330cb4939f5b2ad10e63e00451dde5df385b9f0eaf1a0f21d716939

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